As in any business, not just an internet business, it is extremely important to treat your customers like finest jewelry. You don't want jewelry to tarnish, because its value will radically diminish. You also don't want to tarnish your relationships with your customers. They're life-blood of your business and will decide overall success of your business.Suppose you get two offers for a product that you're interested in. Both are offering same product, but one is from a company that you've dealt with in past and also had a positive experience. Which company are you going to buy from? The stranger, or business you had a positive experience with?
"What you reap is what you sow." The better you treat your customers more likely they are to continue buying from you. While others may make a quick profit by selling an inferior product with a high mark up, you'll be much more successful in long run by offering nothing but best service and products to your customers.
Many marketers start out by offering a product or service where they actually lose money. Why would they do this? Well, they know that real money is in repeat sales.
Think about it. On web, most marketers make one sale out of every hundred visitors. Those visitors may not trust you because of past bad experiences on web. Some may have clicked a wrong link. Some may be curious but not certain if they'll get their money back if they're not satisfied. Plus, YOU HAVE TO WORK VERY HARD JUST TO GET THESE VISITORS!
Now consider that you've been in business for five years and have a long list of happy customers. You do no work to attract your prospects, you have their names and they look forward to receiving your offers. They know you and trust you. They don't think of you as a stranger but as someone who is trying to enrich their lives. They know that if they bought a product they're not happy with, you'd insist they get their money back. Plus you know exactly what kinds of products they want to buy.